# Build a shared libgcc library with the darwin linker.
SHLIB_SOVERSION = 1
SHLIB_VERSTRING = -compatibility_version $(SHLIB_SOVERSION) -current_version $(SHLIB_SOVERSION).0
SHLIB_EXT = .dylib
SHLIB_SUFFIX = `if test @multilib_dir@ = ppc64 ; then echo _@multilib_dir@ ; fi`
SHLIB_INSTALL_NAME = @shlib_base_name@$(SHLIB_SUFFIX).$(SHLIB_SOVERSION)$(SHLIB_EXT)
SHLIB_SONAME = @shlib_base_name@.$(SHLIB_SOVERSION)$(SHLIB_EXT)
SHLIB_SOLINK = @shlib_base_name@.so
SHLIB_MAP = @shlib_map_file@
SHLIB_OBJS = @shlib_objs@
SHLIB_DIR = @multilib_dir@
SHLIB_LC = -lc

# Darwin only searches in /usr/lib for shared libraries, not in subdirectories,
# so the libgcc variants have different names not different locations.
# Note that this version is used for the loader, not the linker; the linker
# uses the stub versions named by $(LIBGCC).
SHLIB_LINK = $(GCC_FOR_TARGET) $(LIBGCC2_CFLAGS) -dynamiclib -nodefaultlibs \
	-Wl,-install_name,$(slibdir)/$(SHLIB_INSTALL_NAME) \
	-single_module -o $(SHLIB_DIR)/$(SHLIB_SONAME).tmp \
	-Wl,-exported_symbols_list,$(SHLIB_MAP) \
	$(SHLIB_VERSTRING) \
	@multilib_flags@ $(SHLIB_OBJS) $(SHLIB_LC)

# $(slibdir) double quoted to protect it from expansion while building
# libgcc.mk.  We want this delayed until actual install time.
SHLIB_INSTALL = \
	$$(mkinstalldirs) $$(DESTDIR)$$(slibdir); \
	$(INSTALL_DATA) $(SHLIB_SONAME) \
	  $$(DESTDIR)$$(slibdir)/$(SHLIB_SONAME)

SHLIB_MKMAP = $(srcdir)/mkmap-flat.awk
SHLIB_MKMAP_OPTS = -v leading_underscore=1
SHLIB_MAPFILES += $(srcdir)/libgcc-std.ver

# Must use a different directive for hidden visibility in assembly sources.
ASM_HIDDEN_OP = .private_extern

# In order to support -mmacosx-version-min, you need to have multiple
# different libgcc_s libraries that actually get linked against, one for
# each system version supported.  They are 'stub' libraries that
# contain no code, just a list of exported symbols.
# The actual use of the libraries is controlled by REAL_LIBGCC_SPEC.
#
# This assumes each multilib corresponds to a different architecture.
libgcc_s.%.dylib : $(SHLIB_VERPFX).%.ver stmp-multilib
	# When building multilibbed target libraries, all the required
	# libraries are expected to exist in the multilib directory.
	MLIBS=`$(GCC_FOR_TARGET) --print-multi-lib \
		| sed -e 's/;.*$$//' -e '/^\.$$/d'` ; \
	for mlib in $$MLIBS ; do \
	  rm -f $${mlib}/$@ || exit 1 ; \
	  $(LN_S) ../$@ $${mlib}/$@ || exit 1 ; \
	done
	MLIBS=`$(GCC_FOR_TARGET) --print-multi-lib \
		| sed -e 's/;.*$$//' -e '/^\.$$/d'` ; \
	for mlib in '' $$MLIBS ; do \
	  $(STRIP_FOR_TARGET) -o $(@)_T$${mlib} \
	    -s $(SHLIB_VERPFX).$(*).ver -c -u \
	    ./$${mlib}/libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT).tmp || exit 1 ; \
	done
	$(LIPO_FOR_TARGET) -output $@ -create $(@)_T*
	rm $(@)_T*

libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT): stmp-multilib libgcc_s.10.4.dylib \
	libgcc_s.10.5.dylib
	# When building multilibbed target libraries, all the required
	# libraries are expected to exist in the multilib directory.
	MLIBS=`$(GCC_FOR_TARGET) --print-multi-lib \
		| sed -e 's/;.*$$//' -e '/^\.$$/d'` ; \
	for mlib in '' $$MLIBS ; do \
	  cp ./$${mlib}/libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT).tmp \
	    ./libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T_$${mlib} || exit 1 ; \
	done
	$(LIPO_FOR_TARGET) -output libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT) \
	  -create libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T*
	rm libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T*

# From the point-of-view of the Makefiles, libgcc is built by the 'strip'
# and 'lipo' commands above.
LIBGCC=libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT) libgcc_s.10.4.dylib \
	libgcc_s.10.5.dylib stmp-multilib

INSTALL_FILES=libgcc_s.10.4.dylib libgcc_s.10.5.dylib libgcc_s.1.dylib

install-darwin-libgcc-stubs : $(INSTALL_FILES) installdirs
	for d in $(INSTALL_FILES) ; do \
	  $(INSTALL_DATA) $$d $(DESTDIR)$(slibdir)/$$d || exit 1 ; \
	done
	if [ -f $(DESTDIR)$(slibdir)/libgcc_s_ppc64.1.dylib ]; then \
	  rm -f $(DESTDIR)$(slibdir)/libgcc_s_ppc64.1.dylib; \
	else true; fi
	$(LN_S) libgcc_s.1.dylib \
		$(DESTDIR)$(slibdir)/libgcc_s_ppc64.1.dylib
	if [ -f $(DESTDIR)$(slibdir)/libgcc_s_x86_64.1.dylib ]; then \
	  rm -f $(DESTDIR)$(slibdir)/libgcc_s_x86_64.1.dylib; \
	else true; fi
	$(LN_S) libgcc_s.1.dylib \
		$(DESTDIR)$(slibdir)/libgcc_s_x86_64.1.dylib

INSTALL_LIBGCC = install-darwin-libgcc-stubs install-multilib
